Add comments on magic number 0xbb. They are VK_OEM_PLUS. I guess the original...

views/controls/textfield/native_textfield_win.cc

 // Copyright (c) 2009 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "app/l10n_util.h"
 #include "app/l10n_util_win.h"
 #include "app/win_util.h"
 #include "base/clipboard.h"
 #include "base/gfx/native_theme.h"
 #include "base/scoped_clipboard_writer.h"
@@ skipping 428 matching lines @@
         break;
       if (GetKeyState((key == 'V') ? VK_SHIFT : VK_CONTROL) >= 0) {
         ScopedFreeze freeze(this, GetTextObjectModel());
         OnBeforePossibleChange();
         Paste();
         OnAfterPossibleChange();
       }
       return;
 
     case 0xbb:  // Ctrl-'='.  Triggers subscripting, even in plain text mode.
+                // We don't use VK_OEM_PLUS in case the macro isn't defined.
+                // (e.g., we don't have this symbol in embeded environment).
       return;
 
     case VK_PROCESSKEY:
       // This key event is consumed by an IME.
       // We ignore this event because an IME sends WM_IME_COMPOSITION messages
       // when it updates the CRichEditCtrl text.
       return;
   }
 
   // CRichEditCtrl changes its text on WM_KEYDOWN instead of WM_CHAR for many
@@ skipping 404 matching lines @@
 ////////////////////////////////////////////////////////////////////////////////
 // NativeTextfieldWrapper, public:
 
 // static
 NativeTextfieldWrapper* NativeTextfieldWrapper::CreateWrapper(
     Textfield* field) {
   return new NativeTextfieldWin(field);
 }
 
 }  // namespace views